JPH0248986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder mechanism, and relates to a cassette tape recorder in which the mechanical parts of each operating section are simplified and the operability is improved so that queue operation, review operation, etc. can be performed. be.

Conventionally, most cassette tape recorders have generally had a single-motor mechanical mechanism, and have also used flywheel inertia or a large plunger solenoid to electrically perform play (PLAY), fast forward (FF), It was used to perform actions corresponding to each operation such as rewind (RW). Therefore, the mechanism of each part is complicated and large, and there are many levers etc., which not only makes it difficult to operate, but also
The plunger direct method inevitably increases costs. Additionally, there were many cases in which the queue operation during FF operation and the review operation during RW operation were not possible. Further, the conventional trigger mechanism has disadvantages in that the timing of converting from one mode to another function mode tends to be delayed, and the time required for response to the operation is long.

The present invention is an inexpensive cassette tape recorder which improves the problems of the conventional example described above, and which is capable of operating in various modes such as fast forward/queue operation, rewind/review operation, etc., and which is simplified and improves the operability of each part. It provides:

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing an embodiment according to the present invention, in which 1 is a tape recorder body chassis, 2 is a supply reel shaft, 3 is a take-up reel shaft, 4 is a cassette tape,
5 is a supply reel, 6 is a take-up reel, 7 is a head base installed in the tape recorder body 1, and 8 is a head base dump plate installed in relation to the head base 7, forming a cam block 8a. Reference numeral 9 denotes a magnetic head such as a magnetic recording/reproducing head, which is fixed to the head base 7 and is slidably mounted integrally with the head base 7. 1
0 is a reel drive motor, which transmits power from the drive motor pulley 10a to the supply reel shaft 2 or the take-up reel shaft 3 via the idler 11.

Further, 12 is a capstan motor pulley of a capstan drive motor, which rotationally drives the flywheel 14 via a belt 13.

The above flywheel 14 is a capstan shaft 15
The capstan 15a and the capstan gear 15b rotate together.

Further, 16 is a two-stage plunger 16a, 16b attached to the chassis 1 of the tape recorder main body.
, the FD trigger lever 1 rotates around the fulcrum 17.
8 and a FR trigger lever 20 that rotates around a fulcrum 19 are configured to be independently vertically movable via pivot points 17a and 19a. 21 is the FD trigger gear, 22 is the FR trigger gear, and the FD trigger gear 21 is the FD trigger gear 2.
FD cam gear 23, FR cam gear 22 with the same number of teeth as 1
FR cam gear 2 with the same number of teeth as FR trigger gear 22
4 are in a constant state of chewing.

Cam 2 integrally fixed to the above FD cam gear 23
When the FD cam gear 23 is rotated by the FD trigger gear 21, the FD cam gear 3a comes into contact with the cam block 8a of the head base dump plate 8, and moves the head base dump plate 8 upward. Also, F.R.
The cam 24a integrally fixed to the cam gear 24 is
When the FR cam gear 24 is rotated by the FR trigger gear 22, the above-mentioned rising wall 7 of the head base 7
The head base 7, on which the magnetic head 9 is fixed by contacting the head a, is moved downward.

On the other hand, the FD trigger lever 18 and the FR trigger lever 20 are biased clockwise by springs SP ₁ and SP ₂ , respectively. At this time, the cam 25 protruding from the rotating shaft of the FD trigger gear 21 comes into contact with the tip 18a of the FD trigger lever 18 and rotation is stopped. A notch 21a is formed, and the rotational force of the capstan gear 15b is not transmitted thereto. Also FD
The trigger gear 21 includes a cam 2 protruding from the rotating shaft.
A stopper 26 is provided in a predetermined relationship with 5, and a spring _SP3 is provided to urge the FD trigger gear 21 to rotate clockwise in the illustrated state.

Further, in the FR trigger gear 22, a cam 27 protruding from the rotating shaft is connected to the tip 20a of the FR trigger lever 20.
The rotation is stopped by contacting the capstan shaft 15, and the capstan gear 15b of the capstan shaft 15 meshes with the capstan gear 15b.
A notch 22a is formed in the FR trigger gear 21, and the rotational force of the capstan gear 15b is not transmitted thereto. In addition, the FR trigger gear 22 has
A stopper 28 is provided in a predetermined relationship with a cam 27 protruding from the rotating shaft.
A spring SP ₄ is provided to urge the FD trigger gear 22 to rotate clockwise.

In addition, SP ₅ in the figure is a pin 29 protruding from the surface of the chassis 1 of the tape recorder main body, and a head base 7.
This spring is stretched between a predetermined position between the magnetic head 9 and the magnetic head 9, and integrally urges the head base 7 to which the magnetic head 9 is fixed downward in the figure. Further, SP ₆ is a spring stretched between the head base 7 and the head base dump plate 8, and when the head base dump plate 8 is pushed upward by the cam 23a of the FD cam gear 23, the spring SP ₆ Lift the head base 7 against the spring SP ₅ ,
The magnetic head 9 is designed to move smoothly.

In addition, the vertical positional relationship of each part in the figure is that on the back side of the tape recorder main body chassis 1, the capstan drive motor 12, FD trigger gear 21, FR trigger gear 22, FD cam gear 23, FR cam gear 24,
and the capstan gear 15b are located,
An FD trigger lever 18 and an FR trigger lever 20 are related.

In addition, the flywheel 14 is connected to the capstan shaft 1.
A head base 7 and a head base dump plate 8 are located on the top surface of the tape recorder body chassis 1, and a magnetic head 9 is fixed to the top surface of the head base 7. ing. The cassette tape 4 is constructed such that holes in the supply reel 5 and take-up reel 6 are fitted into the supply reel shaft 2 and take-up reel shaft 3 which protrude from the upper surface of the tape recorder body chassis 1.

Next, in the basic structure constructed as described above, after the cassette tape 4 is fitted into the tape recorder main body, the magnetic head 9 is driven by the rotational energy of the flywheel 14, which rotates as the capstan drive motor 12 rotates. The trigger mechanism for the play state to be moved will be described in detail. Figures 2A to 2D show the positional relationship of each part when performing basic operations. FIG. 2A shows the reset state, and now when the plunger 16a is released and the FD trigger lever 18 is rotated clockwise about the fulcrum 17, the tip 18a of the FD trigger lever 18 comes off from the cam 25 of the FD trigger gear 21 and springs up. With SP ₃ , the FD trigger gear 21 rotates vigorously, and the stopper 26 touches the tip 18a of the FD trigger lever 18.
The FD trigger gear 21 stops rotating as it comes into contact with the. At this time, the notch 21a of the FD trigger gear 21
There is a gap _d1 between the capstan gear 15b and the capstan gear 15b, and the two do not mesh. Therefore, FD trigger gear 21
The FD cam gear 23, which is in a constantly engaged state, rotates counterclockwise by the amount of rotation of the FD trigger gear 21, and the cam 2
3a is the cam block 8 of the head base dump plate 8
Since it is in a state away from a, the magnetic head 9 has not moved upward. Note that at this time, the distance between the center of the FD cam gear 23 and the end face of the cam 23a is _H1 .

FIG. 2B shows that when the play signal is input from the reset state, that is, when the FD trigger lever 18 is rotated counterclockwise by the plunger 16a, the tip 18a of the FD trigger lever 18 comes off the stopper 26, and the FD Trigger gear 21 is rotated by spring _SP3 and meshes with capstan gear 15b. Therefore, the rotational force of the flywheel 14 causes the FD trigger gear 21 and
When the FD cam gear 23 is rotated to the state shown in Fig. 2 C, the capstan gear 15b is rotated.
It comes off at the notch 21a of the FD trigger gear 21, and the cam 2 is rotated vigorously by the spring SP ₃ .
5 comes into contact with the tip 18a of the FD trigger lever 18, and rotation is stopped. At this time, capstan gear 15
b and the notch 21a form a gap d ₂ , and the FD cam gear 2 which was rotating while meshing with the FD trigger gear 21
The end face of the cam 23a of No. 3 is aligned with the center of the FD cam gear 23.
It has a distance H ₂ (H ₁ ≪H ₂ ) and pushes up the cam block 8a of the head base dump plate 8, and the operation of the head base dump plate 8 also pushes up the head base 7 to which the magnetic head 9 is fixed. The magnetic head 9 comes into contact with the cassette tape at a predetermined position and the playing state is maintained.

FIG. 2 D shows the release of the play state. When the plunger 16a pushes down the FD trigger lever 18 clockwise and removes the tip 18a from the cam 25, the SP ₅ tensioned between the spring SP ₃ and the pin 29 is released.
Since the FD cam gear rotates due to the tension, the FD trigger gear 21 rotates vigorously and slightly, and the stopper 26 comes into contact with the tip 18a. At this time,
FD cam gear 2 meshing with FD trigger gear 21
3 also rotates, and the end face of the cam 23a is connected to the FD cam gear 2.
3 and has a distance of H ₃ (H ₁ < H ₃ < H ₂ ),
The cam 23a is removed from the cam block 8a of the head base dump plate 8. Therefore the spring SP ₅ ,
At SP ₆ , the head base 7 and the head base dump plate 8 are returned to the above-mentioned reset state, that is, the state shown in FIG. 2A.

Next, the trigger mechanism for intermediate movements such as queue operation, review operation, pause operation, etc. in the play state of the tape recorder will be described in detail.

FIGS. 3A to 3C show the positional relationship of each part when performing basic operations. Figure 3A shows the reset state, and is in the same positional relationship as Figure 2A.
So when the play signal is input, plunger 1
6a is activated and rotates the FD trigger lever 18 counterclockwise, the tip 18a of the FD trigger lever 18
is separated from the stopper 26, and the FD trigger gear 21
is rotated vigorously by spring SP ₃ ,
It meshes with the capstan gear 15b. Then, the FD trigger gear 21 and the FD cam gear 23 are rotated by the rotational force of the flywheel 14, and rotate until the tip 18a of the FD trigger lever 18 comes into contact with the cam 25. At this time, the capstan gear 15b is
As the FD trigger gear 21 is disengaged at the notch 21a, the cam 23a of the FD cam gear 23, which has been rotating while meshing with the FD trigger gear 21, pushes up the cam block 8a of the head base dump plate 8, and the cam block 8a of the head base dump plate 8 is pushed up. The operation also pushes up the head base 7 to which the magnetic head 9 is fixed, thereby maintaining the playing state of the cassette tape as shown in FIG. 3B. In the play state described above, when performing a cue operation, a review operation, or a pause operation for tape running, the plunger 16b is actuated by a predetermined function operation in the state shown in FIG. rotate clockwise
Release the tip 20a of the FR trigger lever 20 from the stopper 28 of the FR trigger gear 22. At this time, the FR trigger gear 22 is vigorously rotated clockwise by the spring SP ₄ , and the capstan gear 15b
meshes with Therefore, the FR trigger gear 22 and the FR cam gear 24 are simultaneously rotated by the rotational force of the flywheel 14, and when the capstan gear 15b is released at the notch 22a of the FR trigger gear 22, the FR trigger gear 22 is vigorously rotated by the spring SP ₄ and the FR The tip 20a of the trigger lever 20
It comes into contact with the cam 27 of the FR trigger gear 22 and stops rotating. At this time, the cam 24a of the FR cam gear 24, which rotates at the same time as the FR cam gear 22, comes into contact with the rising wall 7a formed on the head base 7, as shown in FIG. 3C, and pushes the head base 7 downward in the figure.

Therefore, the magnetic head 9 fixed to the head base 7 has a weaker pressing force against the tape surface of the cassette tape 4, making it possible to perform cue, review, and pause operations in the play state without damaging the tape. Also, at this time, the cam 2 of the FD cam gear 23
At 3a, the head base dump plate 8 is pushed upward, and the head base 7 is also pushed upward by the spring SP ₆ against the spring SP ₅ , so that the playing state of the tape recorder is maintained and the cue operation and By the review operation,
The head base 7 is pushed down by itself against the spring SP ₆ without the head base dump plate 8 returning. In addition, queue operation,
Whether the review operation or the pause operation is set is related to the driving of the reels and the like, but since it is not relevant to this invention, the explanation will be omitted.

Next, in order to restore the play state again from the queue operation, review operation, and pause operation in the play state, cancel the operation of the plunger 16b,
This is to release the force applied to the FR trigger lever 20. At this time, the FR trigger lever 20 is rotated clockwise by the spring _SP2 , and at the same time, the tip 20a is separated from the cam 27 of the FR trigger gear 22, and the spring SP2 is rotated clockwise. ₄ causes FR trigger gear 2
2 is rotated vigorously and the stopper 27 is
It comes into contact with the tip 20a of the FR trigger lever 20 and stops rotating. Therefore, the FR cam gear 24 meshing with the FR trigger gear 22 also rotates, and the cam 24a is separated from the rising wall 7a of the head base 7 and restored, so that the head base 7 to which the magnetic head 9 is fixed is rotated.
is pulled upward in the figure by spring SP ₆ to restore the playing state.

In addition, in order to return from the play state to the stop state, the plunger 16a is actuated by the function operation, as detailed in FIG.
When the tip 18a of the FD trigger gear 18 is separated from the cam 25 of the FD trigger gear 21, the spring SP ₃ and
FD trigger gear 21 and FD cam gear 2 by SP ₅
3 rotates and the cam 23a is removed from the head base dump plate 8, so the head base 7 is pulled back downward together with the head base dump plate 8 by springs _SP5 and _{SP6 and} stopped.

Next, a brake mechanism that eliminates the problem of the tape hanging down, becoming tangled, or being rolled up due to the inertial force of the supply reel 5 or the take-up reel 6 will be described in detail.

FIG. 4 is an explanatory diagram showing this brake mechanism. Reference numeral 30 indicates a reel holder for the supply reel 5, 31 indicates a reel holder for the take-up reel 6, and 32 controls the rotation of both reel holders 30 and 31 at a predetermined level. It is a two-pronged brake plate that applies braking in response to instructions. On the braking surface of the brake plate 32, there are brake pads 32a,
32b is fixed. Further, pins 33a, 33 protruding from the forked brake plate 32 are provided.
A spring 34 is engaged with b, and is always in pressure contact with the reel pedestals 30 and 31. Further, a brake release plate 35 is engaged with the brake plate 32, and the cam 24a of the FR cam gear 24 and the small cam 23b of the FD cam gear 23 push down the brake release plate 35 downward in the figure and engage the brake release plate 35. The brake plate 32 is used to release the brake.

Also, when the FR cam gear 24 is released by the operation of the FR trigger lever 20 in the queue state, review state, or pause state, it separates from the brake release plate 35, but the small cam 23b of the FD cam gear 23
Since the parts are in contact with each other, the brake pads 32a and 32b of the brake plate 32 maintain the brake released state. As can be seen from Fig. 4, this brake mechanism consists of the small cam 23 of the FD cam gear 23.
The brake is always released as long as either the cam 24a of the FD cam gear 24 engages with the brake release plate 35 and presses it in the brake release direction.

As described above in detail, the tape recorder according to the present invention has drive units for the supply reel and take-up reel of the cassette tape, and drive units for performing play, fast forward, rewind, queue and review operations by each function operation. The configuration is simplified by dividing the trigger mechanism, and the delay in operational response in the conventional trigger mechanism is improved. Also,
Unlike conventional trigger mechanisms, the number of parts is greatly reduced and the cost can be reduced.

That is, the trigger mechanism for smoothly resetting, playing, and stopping the tape recorder is configured to be performed by an FD trigger gear and an FD cam gear driven by a capstan gear, and the timing of the FD trigger gear and FD cam gear can be controlled by a function. In addition, the trigger mechanism for smoothly performing the queue operation and review operation is performed by the FR trigger gear and the FR cam gear driven by the capstan gear. The timing of the above-mentioned FR trigger gear and FR cam gear is configured so that the two-stage plunger is operated by function operation or manually via the FR trigger gear, so it is easy to operate and can operate reliably. It is.

Also, when FF operation and REW operation are stopped,
A braking mechanism for taking up slack in tape running is performed by a cam driven in relation to an FR trigger gear and an FR cam gear, ensuring smooth operation of the tape recorder in each mode.

Furthermore, the cam shape that allows each mechanism to operate smoothly is also formed to correspond to the specified operation, so it operates effectively even with the slightest movement, and has great practical effects such as no operational errors. .

[Brief explanation of drawings]

FIG. 1 is an overall plan view illustrating an embodiment of the invention, FIGS. -C are plan views showing the key and review operations of the main parts according to the present invention, and Fig. 4 is a plan view of the main parts showing the brake mechanism according to the invention. DESCRIPTION OF SYMBOLS 1... Tape recorder body chassis, 2... Supply reel shaft, 3... Take-up reel shaft, 4... Cassette tape, 5... Supply reel, 6... Take-up reel, 7... Head base, 8... Head base dump plate, 8a...cam block, 9...magnetic head, 12...capstan motor pulley, 14
...Flywheel, 15...Capstan shaft,
15b...Capstan gear, 16...Plunger, 18...FD trigger lever, 18a...Tip, 20...FR trigger lever, 20a...Tip,
21...FD trigger gear, 22...FR trigger gear, 23...FD cam gear, 23a...cam, 2
4...FR cam gear, 24a...cam, 25...
Cam, 26... Stopper, 27... Cam, 28
... Stopper, 30, 31 ... Reel cradle, 3
2...brake plate, 34...spring,
35...Brake release plate.

Claims (1)

[Claims] 1. In a tape recorder operation mechanism that uses the rotational force of the flywheel to switch to a predetermined operation mode, the outer peripheral gear has a notch in a part, is biased in one direction by a spring, and is connected to the flywheel. A first gear that causes mode switching by meshing with a capstan gear provided coaxially, a first cam gear that has a cam for raising and lowering the head base and meshes with the gear, and a first cam gear that rotates around a fulcrum. a first trigger lever that is freely movable and engages with the first gear at one end; and a first gear that has a notch in a part of an outer peripheral gear, is biased in one direction by a spring, and meshes with the capstan gear. a second gear provided at a different position from the head base; a second cam gear having a cam for raising and lowering the head base and meshing with the second gear; The structure includes a second trigger lever that engages with the second gear, a brake release plate that engages with the cam of the second cam gear, and a brake plate that engages with the brake release plate. The rotational position of the first gear is adjusted by engaging one end of the first trigger lever so that the first gear is disengaged and the capstan gear enters the notch of the first gear. A cam for holding the first gear is provided on the central axis side of the first gear, and a stopper for holding the rotational position of the first gear at a position immediately before meshing with the capstan gear is provided on the outer peripheral side of the first gear. According to
When the first trigger lever and the cam engage, the first cam gear causes the recording and playback state to be brought to a state, and when the first trigger lever and the stopper engage, the state is brought to a stop state, and the recording and playback state is brought about. When the cam of the second gear and the second trigger lever are engaged in the playback state, the second cam gear causes fast forwarding, rewinding, or a pause state; and,
During fast forwarding, rewinding, or pause during recording and playback, the cam of the second cam gear presses the brake release plate, causing the brake plate engaged with the brake release plate to be in the brake release state. A tape recorder characterized in that the tape recorder is configured to hold the tape recorder.