JPH0345289Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention is provided with a switching mechanism for switching to each operation mode: a play state for recording and playback, a cue or review state for locating the beginning of a song, and a stop state. The present invention relates to a tape player, and particularly relates to a switching device that fixes the transfer of the tape and prevents recording from being left unerased when switching from a play state to a stop state.

[Technical background and conventional technology]

FIG. 10 is an explanatory diagram of the tape feeding operation of the tape player.

FIG. 10 shows a play state for recording and reproducing. At this time, the magnetic head H advances upward in the figure and comes into pressure contact with the tape T in the cassette 1. At the same time, the pinch roller 4 advances, and the tape T is held between the capstan shaft 3 and the pinch roller 4, which are rotated at a constant speed. Then, the tape T is fed out by the rotation of the capstan shaft 3, and the tape T is fed out into the cassette 1.
The inner reel _R1 is driven by the reel shaft 5 and the tape T is wound. During this time, the magnetic head H performs a reproducing operation.

In this type of tape player, when switching from the play state to the stop state as shown in FIG. 10, the head base is moved downward in the figure to separate the magnetic head H from the tape T and the pinch roller 4 from the capstan 3, and then The power to 5 is cut off. The reel stand 5 is driven by disengaging the drive gear driven by the motor from the gear of the reel stand 5, or by stopping the motor with the gears still engaged.

[Problems with conventional technology]

However, in the conventional tape player, when shifting from the play state to the stop state, the operation of separating the pinch roller 4 from the capstan 3 and the operation of cutting off the power to the reel stand 5 are performed almost simultaneously. Therefore, even if the pinch roller 4 is separated from the capstan 3 and the feeding force to the tape T is released, the power of the motor is cut off due to the inertia of the reel stand 5 itself, or if it remains connected to the motor. Due to the inertia of the rotor in the subsequent motor, the tape reel _R1 may be slightly driven and the tape T may advance slightly. In particular, if the power to the reel stand 5 is cut off after the pinch roller 4 is separated from the capstan 3 due to a timing delay, the tape T after the player stops is
The amount of progress will increase.

If the tape T advances after the player stops after performing a recording operation in this way, problems such as unerased sounds or bias recording will occur.

[Purpose of invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and when transitioning from the play state to the stop state, the power to the reel stand is cut off and the tape is temporarily fixed, thereby eliminating the need for tape. It is an object of the present invention to provide a switching device for a tape player that prevents the occurrence of excessive forward movement.

[Structure of the idea]

The tape player switching device of the present invention is equipped with a reel stand that rotates the tape reel, a capstan that rotates at a constant speed, a pinch roller that faces the capstan, and a magnetic head that moves the pinch roller. a biasing member that biases the head base in a direction away from the tape, a switching cam that moves the head base toward the tape against the biasing member, and a switching gear that rotates together with the switching cam;
In a switching device for a tape player, which is provided with a lock member that locks the switching gear by coming into contact with a stopper protrusion formed on the switching gear, the stopper protrusion of the switching gear prevents the magnetic head from coming into contact with the tape and pinching. The position where the locking member contacts in the play state where the roller contacts the capstan, the position where the locking member contacts in the queue or review state where the magnetic head contacts the tape and the pinch roller leaves the capstan, and the position where the locking member contacts the tape when the magnetic head contacts the tape. The switching gear is formed at a position where the locking member comes into contact with the locking member in the stopped state when the pinch roller is separated from the capstan, and the switching gear is provided with a pinch roller between the play position and the queue or review position. A fourth stopper protrusion is formed that comes into contact with the lock member when the head base is stopped at a slightly retracted position while the head base is in contact with the capstan. When transitioning from the play state to the stop state, power to the reel stand is cut off while the tape is held between the capstan and the pinch roller, so that the tape does not advance after the stop.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9.

Figure 1 is a plan view showing the mechanism of the tape player, Figures 2A to 5 are illustrations of the operation of the switching cam and lock member, and Figures 6 to 9 are illustrations of the operation of the power transmission mechanism to the reel stand. It is a diagram.

In FIG. 1, reference numeral 11 is a chassis. On this chassis 11 is a capstan 12.
is provided. A flywheel 13 integrated with a capstan 12 is provided on the back side of the chassis 11. This flywheel 13 is driven by a motor (not shown). The power of this motor drives the capstan 12 and flywheel 13 counterclockwise in the figure. Furthermore, a drive gear 14 is provided on the flywheel 13 and rotates integrally therewith. Further, above the capstan 12 in the drawing, a take-up reel stand 19 and a supply reel stand 20 are provided. At the base of this reel stand 19 is a reel gear 19.
A is provided at the base of the reel stand 20, and a reel gear 20a is provided at the base of the reel stand 20.

A head base 21 is provided on the chassis 11. A magnetic head H is mounted on the upper surface of the head base 21. The head base 21 is guided by a guide pin (not shown) fixed on the chassis 11 and is supported so as to be slidable in the direction of the arrow AB. Further, the head base 21 is urged in the direction of arrow B by a spring 22. A notch is formed in the center of the head base 21, and the upper side of this notch is bent to form a pressing piece 21a. Further, on the right side of the upper end of the head base 21 in the figure, a guide side 21b formed at the tip of the protrusion and a guide oblique side 21c continuous thereto are formed. In addition, a pinch roller 15 is located at the lower right side of the head base 21.
A drive hole 21d for driving is provided.

As shown in Figure 1 and Figures 6 to 9,
A pinch roller 15 faces the capstan 12. This pinch roller 15 is held by a holder 15a, and the holder 15a is held by the chassis 11.
It is rotatably supported by an upper shaft 15b.
A drive arm 15c is provided at the tip of the holder 15a, and the bent portion of the tip is inserted into the drive hole 21d formed in the head base 21. Further, this holder 15a is biased clockwise by a spring (not shown).

An idle arm 16 is swingably supported at the base of the capstan 12. Further, a gear 17 is provided on the capstan 12 so as to rotate therewith. This gear 17 is formed integrally with the drive gear 14 shown in FIG. 1 in two stages. At the tip of the idle arm 16, a driven gear 18a and an idle gear 18b are integrally formed in two stages. This driven gear 18a meshes with the gear 17, and is in mesh with the idle gear 1.
8b faces the reel gear 19a. A pin 16a is integrally formed on the upper surface of the idle arm 16. The idle arm 16 is urged counterclockwise by a spring (not shown), and the pin 16a is pressed against the right side of the head base 21 by the force of this spring (not shown).

As shown in FIG. 1, a switching gear 25 is provided on the back surface of the chassis 11. This switching gear 2
5 is rotatably supported at its center by a shaft 26. Teeth are formed around the switching gear 25, and these teeth mesh with the drive gear 14.
Rotational force is transmitted from the drive gear 14 to the switching gear 25. However, the drive gear 25 is provided with two missing teeth, X and Y (see FIG. 2A). When either of the missing portions X, Y faces the drive gear 14, no rotational force is transmitted from the drive gear 14 to the switching gear 25.

Further, a switching cam 27 is integrally formed on the surface of the switching gear 25. The pressing piece 21a formed at the center of the head base 21 is pressed against the circumferential surface of the switching cam 27 by the biasing force of the spring 22. The switching cam 2 together with the switching gear 25
7 rotates, the head base 21 is pushed and moved in the direction of arrow A according to the shape of the circumferential surface of the switching cam 27.

As shown in FIGS. 2B, 3B, 4B, and 5 (all back views), a guide surface 31 is continuously formed around the back surface of the switching gear 25. Since this guide surface 31 is stepped,
The central portion of the back surface of the switching gear 25 is formed in a concave shape. This guide surface 31 is formed with three stopper projections a, b, and c. Also, between the stopper protrusions b and c and the switching gear 2
A fourth stopper protrusion d is formed in a central portion of the holder 5.

A lock lever 32 is provided on the back surface of the chassis 11. This lock lever 32 is rotatably supported by a pin 33 fixed to the chassis 11. A lock pin 34 is fixed at the tip of the lock lever 32. The base of the lock lever 32 is the plunger 35a of the solenoid 35.
is connected to. Further, a spring 36 is externally mounted on the plunger 35a, and the elastic force of the spring 36 urges the lock lever 32 clockwise in FIG. 1. The elastic force of the spring 36 brings the lock pin 34 into sliding contact with the guide surface 31.

Next, the operation of the tape player having the above configuration will be explained.

Figure 2A, Figure 3A, Figure 4A, Figure 5, Figure 6
The figures in Figures 9 to 9 are views of each part of the tape player in Figure 1 viewed from the front side, and Figures 2B, 3B, and 4B are views of the tape player viewed from the back side. be.

In the above tape player, the power of the motor drives the flywheel 13, drive gear 14, and gear 1.
7. Furthermore, the capstan 12 is driven to rotate.

Figures 2A, 2B and 6 show the player in a stopped state. Since the switching cam 27 is not pushing the head base 21, the head base 21 is pushed in the direction B by the force of the spring 22, and the magnetic head H is separated from the tape T.
The drive arm 15c formed on the holder 15a of the pinch roller 15 is connected to the drive hole 2 of the head base 21.
It is pushed back towards B by the front side of 1d,
Therefore, the pinch roller 15 is separated from the capstan 12. Further, since the head base 21 is moving in the direction B, the guide side 21b on the right side presses the pin 16a and rotates the idle arm 16 clockwise. So, idle gear 18
b is away from the reel gear 19a.

To fast forward or rewind the tape,
In the same state as the stopped state shown in FIG. 6, the reel gear 19a or the reel gear 20a may be rotated at high speed by a reel motor separate from the motor for driving the capstan 12.

Solenoid 35 in the state shown in Figures 2A and 2B.
When energized for a short time, the lock pin 34 comes off the stopper protrusion a. As a result, the switching gear 25 is rotated in the G direction by the force of a spring (not shown), and thereafter the drive gear 14 meshes with the teeth around the switching gear 25, and the switching gear 25 is driven in the G direction. When the state shown in Figures 3A and 3B is reached, the lock pin 3
4 is engaged with the stopper protrusion b, and the switching gear 25 is stopped. At this time, the tooth missing portion Y is connected to the drive gear 14.
to face. The state shown in FIGS. 3A and 3B is the play state. The head base 21 is the switching cam 2
7, the magnetic head H is pushed in the direction A, and the magnetic head H has advanced to a position where it comes into pressure contact with the tape T, as shown in FIG. At the same time, the drive hole 21d moves forward, so the holder 15a rotates clockwise by the force of the spring, and the pinch roller 15 moves the tape T.
Press it against the capstan 12. In this play state, the tape T is fed by the capstan 3 which rotates at a constant low speed. Also, as shown in FIG. 7, the pin 16a of the idle arm 16 comes off the guide side 21b, so the idle arm 16
6 is rotated counterclockwise by the force of the spring, and the idle gear 18b meshes with the reel gear 19a. The power of the motor is transmitted from a gear 17 that rotates together with the capstan 12 to a gear 18a, and further from an idle gear 18b to a reel gear 19a. This rotates the reel stand 19, rotates the tape reel inside the cassette, and winds up the tape. In this state, the magnetic head H performs recording and reproducing operations on the tape.

From the state shown in Figures 3A and 3B, the solenoid 35
When the lock pin 34 is further driven, the lock pin 34 is removed from the stopper protrusion b. Since the urging force of the head base 21 in the B direction is transmitted to the switching gear 25 via the switching cam 27, the switching gear 25 rotates in the G direction, and the lock pin 34 is now locked to the stopper protrusion c. Become. This is the queue or review state shown in FIGS. 4A and 4B, and at this time, the head base 21 moves slightly in the direction B depending on the shape of the switching cam 27. As shown in FIG. 8, at this time the magnetic head H is in a position where it lightly contacts the tape T. Further, the holder 15a is returned in the direction B by the drive hole 21d of the head base 21, and the pinch roller 15 is separated from the capstan 12. Also, the pin 16a of the idle arm 16
is in contact with the guide oblique side 21c of the head base 21, and the idle gear 18b is in contact with the reel gear 1.
Leave 9a. The reel stand 19 is driven to rotate at high speed by the reel motor, and the tape T is fed out at high speed. At this time, the read signal from the magnetic head H is processed to locate the beginning of the song, etc.

Further, when the solenoid 35 is driven for a short time from the queue/review state shown in FIGS. 4A and 4B, the lock pin 34 comes off the stopper protrusion c. The head base 21 is moved to B by the force of the spring 22.
At this time, the pressing piece 2
The tip of the switching cam 27 is removed from 1a, and the head base 21 returns to the stopped state shown in FIGS. 2A, 2B, and 6.

If the solenoid 35 is kept energized from the state shown in FIGS. 3A and 3B, the lock lever 32 will rotate counterclockwise and the lock pin 34 will come into contact with the fourth stopper protrusion d. (see FIG. 5), the switching gear 25 is locked in that state while the solenoid 35 continues to be energized. At this time, as shown in FIG. 9, the head base 21 is slightly retreated in the B direction. This retreat position is the play position shown in Figure 7 and the cue position shown in Figure 8.
This is the middle of the review position. In this state, since the amount of retraction of the drive hole 21d of the head base 21 is small, the holder 15a is not moved and the pinch roller 15 remains in pressure contact with the capstan 12. However, the guide oblique side 21 of the head base 21
Since the pin 16a of the idle arm 16 is pressed by the pin 16a of the idler arm 16, the idle gear 18b is separated from the reel gear 19a.

In this way, if the states shown in FIGS. 5 and 9 are maintained, the tape is held between the capstan 12 and the pinch roller 15, and the tape is held between the capstan 12 and the pinch roller 15.
The power from idle gear 18b to is cut off. When switching from the play state to the stop state, if the states shown in FIGS. 5 and 9 are interposed for a short time, it is possible to prevent the tape from being transported due to the inertia of the reel stand 19 after the motor has stopped.
That is, when transitioning from the play state shown in FIGS. 3A, 3B, and 7 to the stop state, first, the solenoid 35 is kept energized for a short time,
The states shown in FIGS. 5 and 9 are temporarily maintained, and all motors are stopped at the same time as the solenoid 35 is energized or after a slight delay. Then, after the tape is firmly fixed between the stopped capstan 12 and the pinch roller 15, the power to the reel stand 19G is cut off. Therefore, even if the reel stand 19 attempts to rotate due to the inertia of the reel stand 19 and the tape reel in the cassette, the tape to which the pinch roller 15 is fixed will not be fed, and the tape will no longer run in vain.

After maintaining the conditions shown in Figures 5 and 9 for a short time,
When the solenoid 35 is de-energized, the lock lever 32 is returned to its original position by the force of the spring 36. As shown in FIG. 3A, the switching cam 27 is pushed by the return force of the head base 21 by the spring 22, so that the lock pin 34 is moved to the fourth stopper protrusion d.
If it comes off, even if the drive gear 14 is stopped,
The switching gear 25 rotates in the G direction, and the lock pin 34
hits the stopper protrusion c, Figures 4A and 4B
The state will be the same as when viewing and reviewing the image.
Further, when the solenoid 35 is energized, the lock pin 34 is removed from the stopper protrusion c. Due to the pressing force of the head base 21 in the B direction, the switching gear 2
5 naturally rotates in the G direction and shifts to the stop state shown in FIGS. 2A, 2B, and 6.

That is, when switching from the play state to the stop state, first the solenoid 35 is kept energized for a short period of time, all motors are stopped, then the solenoid is de-energized, and then the solenoid is once energized and then de-energized. It turns out.

In addition, in the example shown in the figure, in the play state,
Although the reel gear 19a is driven by the idle gear 18b, the present invention can be implemented even if the reel gear 19a is driven by a motor other than the drive motor of the capstan 12 in the play state, for example. It is. In that case, when switching from play to stop, the solenoid 35 is maintained in the state shown in FIG. 5, and the motor driving the reel gear 19a and the capstan 12 are
At the same time, the motors driving the motors are stopped. As a result, the tape is held between the capstan 12 and the pinch roller 15, and the tape is not fed by the reel stand 19 even if the inertia of the rotor occurs after the motor driving the reel gear 19a is stopped.

[Effect of idea]

As described above, according to the present invention, the stopper projection that locks on the switching gear in the play state, the cue,
In addition to providing a stopper protrusion that locks in the review state, a fourth stopper protrusion is provided between the two stopper protrusions, and in this state, the pinch roller and the capstan are in pressure contact.
When moving from play to stop, if there is a mode in which the switching gear is locked by this fourth stopper protrusion and the power to the reel stand and capstan is cut off at the same time, the tape is fixed by the capstan and the pinch roller. , even if an inertial force is generated on the reel stand, the tape will not be transferred. Therefore, inconveniences such as unerased sounds and biased recordings do not occur.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a plan view showing the mechanical part of the tape player.
Figures A and 2B are operational explanatory diagrams showing the head base, switching gear, and switching cam in the stopped state. Figures 3A and 3B are operational explanatory diagrams showing the play state. Figures 4A and 4B are in the queue or review state. Fig. 5 is an explanatory diagram of the operation showing the locked state by the fourth stopper protrusion, Fig. 6 is an explanatory diagram of the operation showing the reel stand, pinch roller, etc. in the stopped state, and Fig. 7 is the operation in the play state. 8 is an explanatory diagram of the operation in the queue or review state, FIG. 9 is an explanatory diagram of the operation showing the locked state by the fourth stopper protrusion, and FIG. 10 is an explanation of the tape running state to explain the conventional problems. It is a diagram. 12... Capstan, 14... Drive gear, 1
5...Pinch roller, 19,20...Reel stand,
19a, 20a...Reel gear, 21...Head base, 22...Biasing member, 25...Switching gear,
a, b, c... stopper protrusion of switching gear, d...
Fourth stopper projection, 27...Switching cam, 32...
...Lock lever, 34...Lock pin, 35...
Solenoid, H...magnetic head.

Claims (1)

[Scope of utility model registration request] A reel stand that rotates the tape reel, a capstan that rotates at a constant speed, a pinch roller that faces the capstan, a head base that is equipped with a magnetic head and that moves the pinch roller, and that separates the head base from the tape. a biasing member that biases the head base in the tape direction, a switching cam that moves the head base in the direction of the tape against the biasing member, a switching gear that rotates together with the switching cam, and a stopper protrusion formed on the switching gear. In a switching device for a tape player, which is provided with a locking member that comes into contact with the locking member and locks the switching gear, the stopper protrusion of the switching gear is in a playing state in which the magnetic head contacts the tape and the pinch roller contacts the capstan. The position at which the locking member contacts, the position at which the locking member contacts in the queue or review state where the magnetic head contacts the tape and the pinch roller separates from the capstan, and the position at which the locking member contacts at the stop when the magnetic head leaves the tape and the pinch roller separates from the capstan. The switching gear is formed at a position where the locking member comes into contact with the capstan when the pinch roller is in contact with the capstan between the play position and the cue or review position. 1. A switching device for a tape player, characterized in that a fourth stopper protrusion is formed which contacts a locking member when the tape player is stopped at the same position.