JPH045061Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cueing mechanism for a cassette deck that does not use an electromagnetic plunger as a driving source for transition from a fast forward or rewind state to a play state.

In recent years, cassette decks fast forward or rewind with the cassette tape and magnetic head in gentle contact, detecting silent sections set in advance between songs on the tape, and transitioning to play mode from the beginning of the song. They tend to have a cueing mechanism.
In this case, if an electromagnetic plunger is used as the drive source to shift each mechanism from the fast forward or rewind state to the play state, cueing can be done with a time delay of several tens of milliseconds; If there is no cassette deck, the transition between the above-mentioned states will be delayed, and in the worst case, there will be an inconvenience that the play state will be entered after the beginning of the song.

The present invention is a cassette deck that does not use the above-mentioned electromagnetic plunger for the drive source, and provides a purely mechanical cueing mechanism that enables state transition at high speed.

An embodiment of the present invention will be described below with reference to the drawings. Figures 1 to 4 are auto eject,
FIG. 3 is a partial plan view of an auto-replay type cassette deck. Auto-eject is a function that detects the end of the tape during fast forwarding with the Hall iC, puts it into play mode, and then automatically ejects it. Auto-replay is a function that detects the end of the tape during fast forwarding with the Hall iC, and then automatically ejects the tape when rewinding.
This is a function that moves to the opposite play state when detected by iC. In FIG. 1, reference numeral 2 denotes a motor, which rotates in the direction of the arrow (counterclockwise) when a cassette (not shown) is inserted. The rotational force of the motor 2 is transmitted to the flywheel 6 via the belt 4 and to the gear 10 and the idle gear 12 via the belt 8.
Gear 10 rotates notched gear 18 clockwise via gear 14 and drive gear 16. The idle gear 12 rotates the reel 22 counterclockwise or the reel 24 clockwise via the intermediate gear 20. The switching mechanism for this idle gear 12 is omitted. 26 is a capstan, 28 is a pinch roller, and 30 is a magnetic head.
It is shown in the figure.

The notched gear 18 has a toothed portion 18A that meshes with the drive gear 16 and a toothless portion 18B that causes the drive gear 16 to idle.
It has a dowel 32 for retracting the swing lever on its surface, and a protrusion 34 for locking on its back surface. A swing lever 36 rotates about a shaft 38, and is normally given counterclockwise rotational force by an eject spring 40. The arm 36A of this lever 36 is for ejecting,
Gives a lifting force to a cassette holder (not shown). Further, the arm 36B is used for retracting the head stand when ejecting. Reference numeral 42 denotes a magnetic solenoid, and the distal end portion 44A of the armature 44 engages with the protrusion 34 on the lower surface of the notched gear 18 when energized. This armature 44
When the solenoid 14 is de-energized, it is rotated counterclockwise by the spring 46 and disengaged from the protrusion 34 .

FIG. 1 shows the playing state, and FIG. 2 shows the state of the head etc. at this time. Reference numeral 48 designates a head stand that carries the head 30 and is movable left and right, and at its rear end is the arm 36B of the swing lever 36 shown in FIG.
A protrusion 50 is erected to abut against. A cassette tape 60 is in sliding contact with the head 30 and is held between the capstan 26 and the pinch roller 28. A pinch roller holder 62 rotates around a shaft 64. 66 is a shaft that rotatably supports the pinch roller 28. Reference numeral 68 denotes a spring that rotates the holder 62 clockwise around the shaft 64. By transmitting this force to the pin 70 implanted in the head stand 48 through the claw 62A on the bottom surface of the holder 62, the head stand 48 also rotates. Advance to play position. 6
9 is always in the forward direction (white arrow direction) on the head stand 48
One end 69A is fixed to an amplifier chassis (not shown), and the other end 69B is fixed to the lower surface of the head stand 48. Therefore, this spring 69 and the spring 68
becomes the forward force of the head stand 48. 72 is holder 6
This is a pin provided on the top surface of 2, which will be described later.
When the slanted end of the FF (fast forward) or REW (rewind) lever hits, the holder 62 moves to the pinch roller 28.
The capstan 26 rotates counterclockwise with
move away from At this time, the claw 62B on the bottom surface of the holder 62
The pin 70 also moves back and collides with the pin 70, causing the head stand 48 to move back slightly. This amount of retraction is enough to keep the head 30 in gentle contact with the tape 60, and this is used for detecting a song interval, which will be described later.

FIG. 3 is a partial plan view of the REW lever 74, and 76 is a spring that returns the lever to its initial position. Reference numeral 74A denotes a sloped end of the lever 74, and when this touches the pin 72 in FIG. 2, the slope causes the holder 62 to rotate counterclockwise. A trigger lever 78 rotates around a shaft 80. 82 is a spring that applies a counterclockwise rotational force to the lever. An engaging piece 78A is formed at the lower end of the trigger lever 78 and bent toward the lower surface.
When engaged with the engagement recess 74B of the lever 74,
The REW lever 74 is locked in the pushed position,
Enters REW state. Since FIG. 3 shows the play state, the REW lever 74 has returned to its original position, but when it is pushed in, the protrusion 74C above the recess 74B rotates the trigger lever 78 slightly clockwise, and when it is pushed further, the trigger lever 78 is returned by the spring 82, the engaging piece 78A engages with the recess 74B, and the REW lever 74 is locked in the pushed-in position. Reference numeral 84 represents a stopper lever that is pushed in at the same time. 86 is a pin planted in the REW lever 74,
It is used to push the stopper lever 84. 8
8 is a spring for returning the stopper lever 84. The role of the stop lever 84 is its head 84.
A is positioned approximately above the notched gear 18, and when the swing lever 36 rotates counterclockwise by the force of the eject spring 40, the rotation range is restricted during FF/REW to prevent ejection. In other words, the tip 36C of the swing lever 36
(shown with diagonal lines) is one step higher, and if the stopper lever 84 is in the illustrated position (play state), it can be rotated sufficiently counterclockwise to the eject position, but when the head 84A is in FF/REW. As it moves forward, it collides with the tip end 36C to limit the rotation of the swing lever 36 to a small amount (see FIG. 5).

FIG. 4 is an explanatory diagram of the FF lever 90. this
The tip of the FF lever 90 has the same shape as the REW lever 74, and is arranged so that the REW lever 74 overlaps the FF lever 90. 90A is a tip inclined portion of the FF lever 90, which, like the inclined portion 74A of the REW lever 74 (FIG. 3), is connected to the pin 7 of the pinch roller holder 62.
2 (Fig. 2). 90C, 90B are
This corresponds to the protrusion 74C and recess 74B of the REW lever 74. 90E is a protrusion (cut and raised) corresponding to the pin 86 in FIG. Therefore, when the FF lever 90 is pushed in, the stopper lever 84 moves forward and the recess 90B engages with the engagement piece 78A of the trigger lever 78. 92 is a spring for retracting the FF lever. Protrusion 74D of lever 74, 90,
Reference numeral 90D is for rotating the trigger lever 78 clockwise to release the lock when the other lever is first locked in the push-in position.

FIG. 5 shows the state in which the FF lever 90 is locked at the pushed-in position, and the stopper lever 84 is also moving forward at the same time. In this FF state, the inclined portion 90A of the lever 90 pushes the pin 72 shown in FIG.
The tape 60 is being fast-forwarded away from the capstan 26 (description of the reel drive system will be omitted).
At this time, the claw 62B of the holder 62 rotates counterclockwise and collides with the pin 70, but since the amount of retraction of the head stand 48 is small, the head 30 is moved against the tape 60.
The track interval is detected by a track interval detection circuit (not shown). The difference between cueing and normal fast forward (FF) is whether or not the output of the track detection circuit is enabled, and the distinction is made using a dedicated switch (in the following
(called an APS switch).

That is, when the APS switch is pressed, the output of the song interval detection circuit becomes valid, and when a song interval is detected in the FF state, the power to the electrode solenoid 42 shown in FIG. 1 is temporarily cut off. FIG. 6a shows this situation, and when the solenoid 42 is turned off, the armature 4
4 is rotated counterclockwise by a spring 46, and the engagement piece 44
The engagement between A and the protrusion 34 of the notched gear 18 is released, and the gear 18 becomes rotatable.

The notched gear 18, now rotatable, first rotates clockwise by the elastic force of the eject spring 40 received from the swing lever 36. 3rd when ejecting
As shown in the figure, since the stopper lever 84 is retracted, the swing lever 36 rotates to the vicinity of the solenoid 42. As a result, the toothed portion 18A of the notched gear 18
is rotated to a position where it meshes with the drive gear 16 only by that force. However, during FF/REW, the rotation range of the swing lever 36 is restricted by the stopper lever 84, so the notch gear 18 is then moved using an arc-shaped leaf spring 100 with one end fixed to the tip of the swing lever 36.
Rotate to the engaged position. This state is shown in FIG. 6b. Thereafter, the notched gear 18 is rotated by the motor force from the drive gear 16, and after one revolution, it is locked at the position a in the figure (since the solenoid 42 is energized again).

This notched gear was originally provided for ejecting, but the present invention uses it to cue, that is, to shift to the PLAY state when a song interval is detected in FF/REW. .
A first method for achieving this is to use the dowel 32, which pushes the tip 78B of the trigger lever 78 from the left side and rotates the lever 78 clockwise.
The purpose is to unlock the FF/REW levers 74 and 90. However, the angle θ ₁ at which the dowel 32 rotates to that position can reach nearly 347°, which is nearly 1 second when converted to time, so when the play state is reached, it is recommended to start playing from the middle of the song. It is also possible.

The second method is to use a dowel 102 different from the dowel 32.
is provided at a position where it abuts against the trigger lever 78 earlier than the dowel 32. For example, the 6th
This is a method in which the incisor portions 18B are provided on both sides, as shown virtually by broken lines in FIG. According to this method, the play state can be entered when the gear 18 has rotated by an angle θ ₂ =151°, so the time required for this can be shortened to about 280 ms.

However, in both of the above methods, the motor 2
Since the trigger lever 36 is energized in the rotation range where it receives the driving force, it is difficult to say that the speed is sufficiently high even if two dowels are provided as in the second method.

The present invention further improves this point, and a dowel 104 for releasing the trigger lever is provided at a position close to the tip 78B of the trigger lever 78 when the notched gear 18 is in the locked state. In this way, the trigger lever 78 is unlocked at a slight angle θ ₃ =19.5° after the notched gear 18 rotates. The feature of this method is that not only the position of the dowel 104 is changed, but also that the driving force is generated only by the eject spring 40, that is, the force of the motor 2 is not used.

Figure 7 is an explanatory diagram of this, where the vertical axis is the notched gear driving force, and the horizontal axis is the notched gear rotation angle and replay time (θ=
The time from detecting a song interval to entering the play state at 0°). The driving force for the notched gear 18 includes an eject spring 40, a leaf spring 100, and a motor 2.
There are several types, and in the first and second methods described above, the play state is entered using motor driving force. The rotation angles at that time are θ ₁ and θ ₂ described above. In contrast, in the present invention, only the driving force of the eject spring 40 is applied at a small angle θ ₃ , and therefore the play state can be returned in a short time of 18 ms.

As described above, the present invention has the advantage that a cassette deck that does not use a high-speed electromagnetic plunger as the drive source for moving the head table can perform high-speed cueing using the ejecting spring as the drive source.

[Brief explanation of the drawing]

Figures 1 to 4 are plan views of each part showing an embodiment of the present invention, Figure 5 is a plan view of the main parts in FF mode, Figure 6 is a state diagram of the notched gear, and Figure 7 is the notched gear driving force. FIG. In the figure, 2 is a motor, 16 is a drive gear, 18 is a notch gear, 18A is a toothed part, 18B is an incisor part, 3
4, 42, 44 are electromagnetic notched gear lock mechanisms;
30 is a magnetic head, 32 is a dowel for retracting the swing lever, 36 is a swing lever, 40 is an eject spring, 48 is a head stand, 60 is a tape, and 74 is a
REW lever, 78 is the trigger lever, 84 is the stopper lever, 90 is the FF lever, 100 is the leaf spring,
104 is a dowel for rotating the trigger lever.

Claims (1)

[Scope of claim for utility model registration] A drive gear that is constantly rotated by a motor,
a notched gear having a toothed part that meshes with the drive gear and an incisor part that does not mesh; and a notch gear that holds the notch gear so that the drive gear idles with the incisor part of the notch gear rotated by the drive gear; an electromagnetic notch gear lock mechanism, a swing lever for driving the eject mechanism, and a plate having one end fixed to the swing lever so as to rotate the unlocked notch gear to a position where it can mesh with the drive gear. spring and
An eject spring that applies a driving force to the lever and the notch gear are provided so that the swing lever is rotated to the maximum extent against the elasticity of the eject spring when the notch gear is locked by the locking mechanism. a dowel for retracting the swing lever, a trigger lever that locks the fast forward or rewind lever in the push-in position, and a trigger lever that rotates to prevent the swing lever from rotating to the eject position when the fast forward or rewind lever is locked. It is equipped with a stopper lever that regulates the range, and when the cassette tape is started, the tape is run in fast forward or rewind state with the magnetic head in sliding contact, and when an interval between songs is detected, the notched gear lock mechanism is activated. In the cassette deck cueing mechanism that temporarily releases the notch gear to allow the notch gear to rotate one rotation, the trigger lever is positioned on the notch gear locked by the notch gear locking mechanism at a position close to one end of the trigger lever. A dowel for rotation is provided, and the trigger lever and the fast forward or rewind lever are disengaged by a slight rotation angle of the notched gear when the lock is released. mechanism.